20=10-2s

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Solution for 20=10-2s equation: 



20=10-2s

We move all terms to the left:

20-(10-2s)=0

We add all the numbers together, and all the variables

-(-2s+10)+20=0

We get rid of parentheses

2s-10+20=0

We add all the numbers together, and all the variables

2s+10=0

We move all terms containing s to the left, all other terms to the right

2s=-10

s=-10/2

s=-5

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